Ewido is a CPU hog on old P///s

I just downloaded and installed the trial version of the product and I have to say that it is a CPU hog. I have an old P///-600 w 512MB ram and Win2k and doing a complete system scan it is using 95%+ of the cpu rendering the computer useless. I even had problems with trying to quit the program. The only application running in the system tray at the time, besides Ewido was NOD32 my antivirus.